This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The obsolete RTCIceServer dictionary's url property specifies the URL of a single ICE server to be used while negotiating connections. It was removed from the specification in June 2013 but is still broadly used in older examples and books, so we include documentation here to help adapt old code to new browsers.

This property has been removed from the specification; while it's still supported by many browsers, it should no longer be used. You should instead use the newer urls property, which allows you to optionally specify multiple URLs for the server. Try to update any existing code to use that property instead.


var iceServer = {
                  url = iceServerUrl,

var serverUrl = iceServer.url;

iceServer.url = iceServerUrl;

The value of this property is a DOMString containing the full URL of a server to use during ICE negotiation.


This example creates a new RTCPeerConnection which will use a STUN server at stunserver.example.org to negotiate connections.

myPeerConnection = new RTCPeerConnection({
  iceServers: [
      url: "stun:stunserver.example.org"

Unfortunately, the only way to tell ICE that the server has a backup domain name of stunserver2.example.org is to add a new entry to the iceServers array for it. The urls property lets you include them both in one server, which is more readily maintainable.


Specification Status Comment
WebRTC 1.0: Real-time Communication Between Browsers
The definition of 'RTCIceServer.url' in the version of the specification from 2013-06-03.
Working Draft Draft specification; this property has been removed from later versions of the specification than the old one linked to here.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) 24 (24)[1] ? ? ?
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? (Yes) 24.0 (24)[1] ? ? ?

[1] When support for the RTCIceServer.urls property was added in Firefox 37, this property was deprecated; it should no longer be used. It has in fact been removed from the specification entirely.

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

Experimental Obsolete Property Reference RTCIceServer URL url WebRTC